Survey Metadata

Till, Indicator minerals

Northwest Territories

1992

Till sampling survey, Lac de Gras area, NTS 76D, Northwest Territories, 1992 and 1993.





Location map

(requires an Internet connection)




Survey Description


A total of 209 1-kg till samples were collected in the Lac de Gras area, Northwest Territories in 1992 (n=26) and 1993 (n=183).  The data were released in GSC Open File 2868.  A complete report, including gold grain analysis, was published in GSC Open File 3205.  Approximately 80 ten-kg till samples were also collected for kimberlite indicator mineral analysis.  The KIM data are published in GSC Open File 3079.

Data Description:

Paper report; data lists on diskette (Excel 3.0) (GSC OF 2868).  Paper report; text and data files on diskette (WP, ASCII, Excel 3.0) for GSC OF 3205.

Quantities Analysed:

<0.002 mm and <0.063 mm fractions of till by ICP-AES after aqua regia (3HCl:1HNO3) for 28 elements.  <0.063 mm fraction by INAA for 35 elements (GSC OF 2868).  <0.002 mm fraction by ICP-AES after nitric-aqua regia digestion for 28 elements;  <0.063 mm fraction by INAA for 35 elements.(GSC OF 3205).

Geochem Maps Available:

Proportional dot maps showing dispersal of elements in the <0.002 mm and <0.063 mm fractions (GSC OF 3205).

Other Analyses:

Heavy mineral concentrate for gold grain counts (GSC OF 3205) and kimberlite indicator minerals (GSC OF 3079).

Publication History

Index Publication
1 Ward, B., Dredge, L., Kerr, D. (1994). Till geochemistry, Lac de Gras, District of Mackenzie, Northwest Territories (NTS 76D). Geological Survey of Canada, Open File 2868. (more)
2 Ward, B., Dredge, L.A., Kerr, D. (1994). Surficial geology, Lac de Gras, District of Mackenzie, Northwest Territories. Geological Survey of Canada, Open File 2928. (more)
3 Ward, B.C., Kjarsgaard, I.M., Dredge, L.A., Kerr, D.E., Stirling, J.A.R. (1995). Distribution and chemistry of kimberlite indicator minerals, Lac de Gras map area (76D), Northwest Territories. Geological Survey of Canada, Open File 3079, 161 pages. (more)
4 Ward, B.C., Dredge, L.A., Kerr, D.E. (1996). Trace element geochemistry and gold grain results from till samples, Lac de Gras area, Northwest Territories (NTS 76D). Geological Survey of Canada, Open File 3205. (more)
5 Ward, B.C., Dredge, L.A., Kerr, D.E., Kjarsgaard, I.M. (1996). Kimberlite indicator minerals in glacial deposits, Lac de Gras area, N.W.T. In Searching for Diamonds in Canada, A.N. Le Cheminant, D.G. Richardson, R.N.W. DiLabio, K.A. Richardson (eds). Geological Survey of Canada, Open File 3228, p.191-195. (more)
6 Dredge, L A; Kerr, K E; Kjarsgaard, I M; Knight, R D; Ward, B C. (1997). Kimberlite indicator minerals in till, central Slave Province, Northwest Territories; Geological Survey of Canada, Open File 3426. (more)
7 Kerr, D.E., Knight, R.D. (2005). Till geochemistry, Slave Province, Northwest Territories and Nunavut. Geological Survey of Canada, Open File 5015, CD-ROM. (more)
8 Kerr, D.E., Knight, R.D. (2007). Gold grains in till, Slave Province, Northwest Territories and Nunavut. Geological Survey of Canada, Open File 5463. (more)

Project History

Index Year Project
1 1992-1996 NATMAP Slave Province Project, Quaternary geology component, 1992-1993 (more)

Downloadable Files

Index Description Size (bytes)
1
Diskette to accompany GSC Open File 3205 ( FileID=282 download)
This ZIP file contains a copy of the data diskette released with GSC Open File 3205.  The file contains data originally released with OF 2868 (INAA + ICP-AES) as well as the gold grain data, stats, quality control data and proportional dot maps.
147778
2
Diskette to accompany GSC Open File 3079 ( FileID=274 download)
This ZIP file contains a copy of the data diskette originally released with GSC Open File 3079.  The file contains data for kimberlite indicator minerals.
334954
3
Diskette to accompany GSC Open File 2868 ( FileID=261 download)
This ZIP file contains a copy of the data diskette originally released with GSC Open File 2868 and includes data for INAA analyses on the <0.063 mm fraction, and ICP-AES analyses on the <0.002 mm fraction.
75444

Geographic Extent

Minimum Latitude Maximum Latitude Minimum Longitude Maximum Longitude
64° 65° -112.09° -110°

The geographic extent of the survey is defined by the following polygons:

  • Covers NTS 76D (Lac de Gras) in Northwest Territories and extends into NTS 86A (Winter Lake) to include one sample.

Keywords


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